diff --git a/artiq/protocols/pyon.py b/artiq/protocols/pyon.py
index 23d701bc7..161a30615 100644
--- a/artiq/protocols/pyon.py
+++ b/artiq/protocols/pyon.py
@@ -159,6 +159,7 @@ def store_file(filename, x):
     contents = encode(x, True)
     with open(filename, "w") as f:
         f.write(contents)
+        f.write("\n")
 
 
 def load_file(filename):